Disentangling Drivers of Heat and Freshwater Transport through the Indonesian Seas Across Timescales: Insights from Marine Sediments and Model Simulations

解开印度尼西亚海域跨时间尺度的热量和淡水输送的驱动因素：来自海洋沉积物和模型模拟的见解

基本信息

批准号：
2303513
负责人：
Delia Oppo
金额：
$ 83.2万
依托单位：
Woods Hole Oceanographic Institution
依托单位国家：
美国
项目类别：
Standard Grant
财政年份：
2023
资助国家：
美国
起止时间：
2023-06-01 至 2026-05-31
项目状态：
未结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=2303513&HistoricalAwards=false
关键词：
Disentangling Drivers Heat Freshwater Transport

项目摘要

The Indo-Pacific Warm Pool (IPWP) covers a large area of the tropical western Pacific and eastern Indian Oceans. Recent observations indicate that the IPWP is undergoing profound changes. The Indonesian Throughflow (ITF) is also changing. The ITF moves relatively warm and fresh upper ocean waters from the western Pacific and Indonesian Seas to the Indian Ocean. This movement plays a critical role in the climate of the region. However, limited oceanographic data from the region make separating natural variability from anthropogenic trends challenging. Given the significance of the IPWP, separating multidecadal variability and anthropogenic trends is critical. This study will combine data collected from sediment cores with model simulations to investigate 1100 year of changes in the ITF. As part of this work, K-12 educational material will be created for schools in the Indo-Pacific region. The project will support a graduate student, and a post-doctoral researcher.The team will conduct a modeling – data collection effort to gain insights into the controls of the ITF and how they might differ across time scales and background climate states over the last millennium, including the Industrial Era. New, well-dated, highly-resolved, records of thermocline structure, reconstructed using geochemical and faunal measurements, will extend instrumental records from the ITF region to span the last millennium. Dynamical interpretations of the data will be provided by a hierarchy of ocean and climate models, which will be used to evaluate the dominance of wind and buoyancy forcing on different time scales, and link reconstructed variability to multidecadal variations in tropical Pacific mean state (e.g., the Walker circulation) and the monsoons. Models will also be used to assess if and why modern warming has altered the relationship between global temperature and the Walker circulation, as well as to evaluate the climate impacts of ITF variability and how they are transmitted (atmospheric or oceanic teleconnections) in simulations of the past, and in future projections.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.

印度太平洋暖游泳池（IPWP）覆盖了热带西太平洋和东印度洋的大片地区。最近的观察结果表明，IPWP正在发生深刻的变化。印度尼西亚人的遍布（ITF）也在改变。 ITF将相对温暖和新鲜的上海水从西太平洋和印度尼亚海洋移到印度洋。这一运动在该地区气候中起着至关重要的作用。但是，来自该地区的有限海洋数据使自然变异性与人为趋势挑战分开。鉴于IPWP的重要性，分开多eCadal变异性和人为趋势至关重要。这项研究将将从沉积物核心收集的数据与模型仿真相结合，以研究ITF的1100年变化。作为这项工作的一部分，将为印度太平洋地区的学校创建K-12教育材料。该项目将支持研究生和博士后研究人员。该团队将进行建模 - 数据收集工作，以洞悉ITF的控制，以及它们如何在上一千年（包括工业时代）的时间尺度和背景气候状态下在时间尺度和背景气候状态下有所不同。使用地球化学和动植物测量重建的新的，良好的，高度分辨的热层结构记录将扩展ITF区域的仪器记录，以跨越上一个千年。数据的动力解释将由海洋和气候模型的层次结构提供，该模型将用于评估在不同时间尺度上强迫风和浮力强迫的优势，并将重建的变异性与热带太平洋平均状态的多阶段变化联系起来（例如，Walker Circle）和蒙森。模型还将用于评估全球温度与沃克圆圈之间的关系是否以及为什么现代变暖是否改变了，以及评估ITF可变性的气候影响以及它们在过去的模拟中如何传播（大气或海洋遥控）的传播（大气或海洋遥控）以及未来项目中的奖项，这反映了NSF的法定任务和良好的良好的影响，这表明了良好的良好依据，并具有良好的支持。